Shaft-coupling for grinding-mills.



0. E. NEEDHAM.

SHAFT GOUPLING FOR GRINMNG MILLS.

APPLICATION FILED OUT,16,1912.

l is ii'iiriir'iut- YH; PENHSSTLZVAIA., ASSIGNOR TO BRADLEY Entente@ May5, i914. Serial' No. 7264018.

et Qrlientmn, count" 7. ei1nsylraiiin; have inventief?, am

tm-Couplings far Grinding'- tlie foiiGn'in-g tleriptiof the ingg iii udri wing;

rspreseming like parts,

"his invention relatifs t@ grindii; reriz n Wtifrsin tile inzit Yredure` is in @on by a. susgiende-:i rev- .nluble roll liziiing atgyrz'tnry notion l'elntinn tu if :rnd nfli'inli roll cooperates with anan dia. suoli :i n'iill being" shown in United tdi'n Patent No.lfIQGf'Q.y dated' March l2, 1912. in mills of this type the driven orroll Siint vnnn-srted with an overhead' and suitably suppnrted drivingshaft by :i silbstuntinllv universal Coupling. comprising esstntiullv sirlnsnd outer member tixedly at- -tmrlied td tlio driving shaftnndproviderl with :x belt pulley. and :in inclosed. coperatling' rockingmember or army-headrtzitfed bcdiir and positiv-t. out@ member, the rfiilSimvtt being attached ixedlj: to and dapendingfroni the croissliend.Siwli u winning nature in shown in Vnitvd li'itfitis Pzitviit fr o.721503?) dated tain-inni: 17. i003, and in przuticr mills O' i lim-rodtu n'uist lie maintained' brifrnt-:fd in :di parts in the i from the.nature of parts or' the mill' are lie must severe work. The oil ZitoClosed outer member nt tlit: -mpling in trans' lembi@ quantity, but itmuni im rvnwm.. :it rement intervals for it tnuiul in practice that timGil escapes very rapidly lrniln the outer inei'nber of 'the unisbetweenthe Conta/sting ,27m11- Y tino' susnension nien r t? x n bei No.1.020,092 and news 'l-liis Gunst-ant luliriua tion fr ind its :idjnnctsis wry olijf-@tion i tine ivnste. sind irrt imi nd the mining (if.

. tiefe, material lining* for its; object :i Vntiingi iniii of theprf-uu. inn, in I r-lmrv rat-@ritiri tn. nt' fn/Mins im' improv- 'Lliriiilnicntir. l parts7 .find pre n trie iv in i- .S011 with the iontinirtl nutrir i C02. il

are

Cant so that imougli for a` long run of the mill Cnn lie introduced intothe coupling whenever it is necessary to replenish the stinplv.

The various novel tentures of my invenlfinii will lle fully dfscribed inthe snbjained periti-rati@ :ind iarticulnrly pointed out in thetollmving claims.

- Figure 'l 1 View in elvvlrtinn und Section of n. Sul'licienl. pnrtiunof n, grinding mill 0i the typa referrtd to. vitli one practical nrin ofmy prrssnl; irii-*ntion einlM-)divd therein: Fig. 2 :in enlarged View,mainly Ain diuinetral' sectionr` it lli@ crass-litlurl. the,Cniii'ifrnting tlirusl inrmbers, and the means for retaining liiliriruntin llin pulley 0r Guter member (it tlw universal Coupling whichConnects: the driving Slint't and# the 'mili-shaft of the n'iill.

Referring to Fig'. 'l` the frames l which carry the annular concave .watQ for the bearing; 3, the crossfpir #i supported by the upright framemembers i :ind Sustaining tlie Seat 6 tor the bearing;- T ot thedcpm-idinfg driving' slmt the 'hub 9 ol. tlio drivingr Puiley 10. in{vliili luili the, lower Gnd ot said shaft seiurcd, thrc'vlindritnl'rmt'tun prtinn il bolted t0 and depending 'from tlm niilief-,f lull)and 'terminating' in n flared tulu- 'lmi extension l2 ont@ n'liit'h thebearing 3 is (dumped, Said bott-Oni portion 11 having an internalannular shoulder 123, and tlm coniftired bearing ringv lli sented onsuch simuldGr, to tnleup the Gnd thrust transmitted by the roll-shaft.may lie and :1re all sub- @lzintinllv ns in lnitvd States Patent No.1,020,092 dated Vnrcli 12. i912, except, in such particulars :is will bepointed ontI hereinafter. Tha pulley liub 9 and the' attached depnndingportion 'l1 constitutes an inclosed Guter 0r Snrlrret member of theuniversal' mmpiingr wiivn comments the driving or sus,- nending; sli( tt8 und the suspended, driven roll-shaftwhich in practice carries :it itslmrm @nd 'lio grinding' roll` of Well known rmistrurinn. Titliin thesorket. ii'urniifr nr@ r'lininetrif'zilly dinposcd :ind uprig'litcmufziwd :seats 11G, each usually mada Cil in two parts for convenience,as shown, and coperating with the convex end faces ot segments 1Tcentrally apertured to tit easily upon oppositely extended trunnions 1Swhich project radially from a cross-head il). Herein I have shown thecross-head as tended some distance above and below the trunnions, theupper part ihavinga tapered axial hole 20, Fig. Q, to receive thecorrespondingly tapered end 21 of the roll-shaft l5, which latter islocked in the cross-head in any suitable manner, as by a transverse pin22 projecting -from opposite sides of the shaft and resting onoppositely inclined cam seat-s 23 on the cross-head, one of such seatsbeing shown herein. No claim is made herein to such locking device, asthe same is not ot my invention, The loiver part of the cross-head has atapered, truste-conical recess 24 formed therein co-axial with andcommunicating With the lio-le 20, as clearly shown, but the taper of therecess is materially greater than that of the hole 20, and the recess ismuch larger in diameter. The lower end of the cross-head is shaped topresentan internal annular seat 25 within the lower end or mouth of therecess 24, as shown. to receive an annular neck 26 formed on thesuspension member 27, made as' a spherical segmentand seated in theeoncaved bearing 14e hereinbetore referred to. As will be apparenttheWeight of the roll shaft, roll and cross-head is sustained by the saidseg'- ment 27, which is made otimanganese steel or other suitable,Wear-resisting material, and by the construction referred to above itinterlocks with the cross-head under normal Working conditions, theannular bott-om QQ oi the cross-head seating; upon the fiat top face 29ot the segment surrounding the neck 26. The interlocking of theisc/lenient and cross-head prevents any7 relative lateral movement ofsuch parts, and this is iinportant in mv present invention, for thetapered central Shaft aperturi 30 ot the sen'- ment or suspension member27 is lthereby maintained co-aXia-l Wit-h and a continuation of therecess 24: ot the cross-head. Consequently` while the suspension membercan be readily renewed when necessary it moves with the cross-head as ifit were a unitary part thereof under Working conditions. In priorstructures of this type the main body ot oil introduced into theinolosing or outer member 9, l1 of the coupling by the central hole S*in the driving,r shaft 8, Fig'. l. and such oil as passes through theduets 3l :trom the chamber 8Q,`has escapedgapidly by passing between theopposed surfaces of the cooperating suspension members le: and Q7, itbeing understood that the gyratory movement of the roll shaft iscontinuous While the mill is in operation, and as pointed out previouslythe Waste'ot oil,- the irregular lubrication, and the frequent renewalsof oil are highly objectionable. ln the present. enibodiment of myinvention l obviate the objections noted by attachingf in an oil tightmanner to the tubular extension l2 an oil guard or retainer, shown as atubular trustoconical member preferably made olf cast brass or othersuitable metal and having at its louer end a relatively heavy lateral,annular flange Se which enters in an annular seat 35 :formed in theinterior of the extension l2 inside the shoulder lil thereof. The seathas a cylindrical side Wall and the bot-- tom is at right anglesthereto, as clearly shown iu Q, and the flange Bet is shaped to tit veryaccurately in the seat, and in practice the ,diameter of the flange ismade slightly larger than the diameter ot the seat, so that the flangeot th; retainer is forced by heavy pressure into the seat. This makes anabsolutely {luid-tight and rigid joint. lietivcen-the retainer or `guard33 and the bottom portion oit the outer member of' the coup-ling, aswill be obvious, the retainer being coaxial with the said coupling'member and it is shown as projectingupward there into substantially tothe plane ot the. joint. be tween the hub part il and cylindricalbot-tom part ll oit the coupling member, sce lling: l. Said oil retainerenters the rece 24tin the cross-head, and the roll sha tt passes throughthe retainer', as shown inFig'. l, the inclinah tion ot the Wall ot saidretainer being such that the roll shalt Will have ample room tor itsmaximum gyratory movements, as shown in Fig. l.. So, too, the taper orinclination ofthe Wall of the recess is such that it Will'be clear ofthe oil retainer ay all times and under all conditions ot gyratory moveWment of the roll shaft and its adjuncs. (flonscquently the motion of thecrosslhead is not restricted in any way by the eonstruetion describe ,land by carrying the oil retainer or guard upward it forms an inner Wallfor the lubricantr chamber made by the outer coupling inember, the ctiedepth ot such chamber beingy substantially equal to the depth of theouter cylindrical wall ot the part ll' ot the :aid outer member et tl ecoupling. That. is, oil can be introduced thereinto until its level isjust belenv the top yof'. the retainer 33, innnersing in the oil thesuspension members lll. QT and a, large portion ot the segments 17 andthe trunnioiis, and lower portion ot the cross-head. The lsegnnents l?of the crosshead 'will alternately dip into the oil during' theoperation et the device Y Referring to Fia: 2, it Vwill be seen thatthere is an annular, elongated space or chamber between the exterior otthe retainer 323 and the surrouinling portions of the cross-head andsuspension members fifi, 27, and this chaniber or space is brought intotree, direct and pern'ianent communica tion with the interior of.inclosing niem- Elli tures 36 and into the spare Surrounding theretainer 2li-l, the level ot' the oil within the reeessed part ot" theeroswhead and outside ot' it then being the same. lWhen the mill is setin operation the motion of the inelosed crees-head and it adjunels willol" rourse agitato the luhiieaut and all portions ot tho meehaniemwithin the outer Coupling niemher will he umiutained tlniroughl'i'luhrirated, hut the centrifugal torre generated h i' rotation oi theeoupline will au.-.i i the oil immediately Hurrouudiner the re ainer totlow outward thrfui;;ii the aperturee flo, ilowu to Anletantiall'i' thelevel ot the latter. The oil remaining' in the interior of the reeensedpart ol the rro head. heloi.' suth apertures. will. however. he ample tomaintain t'horoiighljiv lulu-tinted the ailiarent.

parte oi' the Suspension meuihew` ll and 2T. as will he ohrious. whilethe naid parts w'ill also lie luu'iraied lili' the oil outside theeronsdiead. 'l`hu I a veri' eouuploto uniformity ot lulirii'ution i#seemed. together with the rami-iii' t'or holding and retaining a lai-ejeouainitiv nl oil. si'heu thi` mill i9 Stopped the oil outside theruhe-head will flow hall through the aperturea` t until a rouunou levelis eetahlishrd. and as will he manifest there if-1 no esrape ot' oiltrom the Coupling'.

while the retention ot' a large quantity of luhriraiu within thei-oupliue'. with the resulting' 'levi-ease in the frequency forrenewals. and greater uniloroiit)v oly luluiiatiou, are thix priuripalolijven attained 1w nii' inA reutiou it is :il.-o to he olmrvrd that theex- ,elusion olI ,dust and lrit lrom the routaincd luhrirant is animportant l'rat'ure.

l'arioue eliaiijge.\4 or nietlilieatiim` in details tzt' voustrnf'tionand arruugleiiz-eiit mui' he iuailthi those skilled in the art withoutdeparting `l'l'om the spirit and sentie ol' mi' invention a- :-t-tl'orth iu ilu` (unime hereunto annexed.

llavine' tutti' drfrriheil my invention. what l rlaiin as new and desireto y eiure hy liellers Patent iS:

l. 'lhe eoiuhination. with a universal enuplingf ineludine a rloh'edmemher haring a eyliiulrieal outer wall and a ventral hotlom opening androtated ponil'ireljf ahout :i llXQtl vertical axis an inner tuhular wallSurrounding' the opening', forming with thel outer wall a deep annularoil rhauiher, and a' rocking4 eros-head inelosed hy and mounted in Saidmember and l fing a oon-- Centric, tlen'nwafdljY open rr, a shaftattached rigidly t0 the erom-head and ilepending therefrom through andeo-amal with the recess, the inner wall et' the closed member of thecoupling surrounding the shaft and entering the recess in thecrossheatl, and means 'to sustaini'er'ieally the said eoupling, thereces:A ot the cross-heeel being in continuous communication with 'theclosed memhe` of the Coupling above saitl. eoupling-suetaining ineens.

t?. The eombination, with a universal cotipling inelui'ling an outermember havin@ a central opening,T in its bottom, a ei'linclrieal outerwall, and a frustowonieal inner wall surrounding the opening, and aCross-head mounted to roek in and inelosed hy Saiel member.` saidcross-head haring a eo-aXial frueto-eoniral and downwardly,Y open reeessentered hy the Said inner all and in free eommunin-ation laterali;v withthe outer memher of the coupling', oi' a shaft rie-(idly attaehed to thevrees-heart and depending therethrough. the shalt passing through theinner wall ot' the Said coupling' member, and an overhead, vertically)Ysustaimal driving shaft, rigidi)7 secured' to and rotating in `unisonwith the outer Coupling ineuiher, the inner and outer walls et thelatter forming a deep annular oil ehamloer in whieli the rrossdioadreeks, the oil 'liowinah outward from the reviewed portion et theerven-head hy. rei-itriliiiial artion when the mill is in operation.

The combination, with a closed driving' memhei"rotatable about a fixedvertieul axis a pulleyY attached thereto, and :i cross-head mounted toroel; in and inelosecl by the driving memher and having a downward yopen, central rereseed portion, of a shaft rigidly attaehed to andsuspended from the. erosshead eo-axial with and extended through' th:`rerese. un interior tuhular retaining Wall on the flriring memberextended upward around the shaft into the rei-weed portion ol theerom-head. to retainluhrir'aut in and inereuse the elleetii'e depth olthe driving memher while permitting" tree rocking movement of therrosS-head and Shaft, 'intl mesul to A us'tain rertieallv thedrivingmomlier.

vl. The eomhination of a Suspended driven l hal`t'. a rocking` eouplinglmember to which Said Shalitis attached and from which it is snepemled`mid member having a Central, downwardly flared reeese open at its lowerend and surroumlingjr the Shaft, and in free and rontinuousCommunication laterally with the outer coupling member, a closed outercoupling member in which the roekingr member is inelosecl and by whichit is Sustained, Said outer member having a Central opening' in itsbottom for the passage of the Shaft, a tubular, tapered retainer fixedon the outer member eoneenti'rie with the opening. therein and extendedupward :remind the shaft into the recess of the roekine member to retainlubricant in and in- Aithe eilective depth of the outer memr, and avertically supported drivingl shaft 'dii' connected with the latter. c

lfhe combination, with an overhead shaft. and a snepcnded gyratory of auniversal coupling between them Excluding an enter member having, anannular rfi-axial bearing and a tixedly attached i ro-conicaloil-retainer npn'ardly extendongh the bearing7 and a ciosshead nl.; l toroel: in the outer member and to 'drh the eufapend l Shaft is rigidlyatcrosS-head havingr a trastoco-axial With the shaft and j): opensuspension member interbctiveen the annular bearing and the -head andinterloclred detacliably with the latir j. the oil-retainer passingupward 'through the said suspension member, the en brad having a lateralaperture connectg ne rocce-e. thereof at all times with the ding; memberbelonv the top of ii-retainer and above .said annular bearcombination=with an overhead, euatained shaft, and a suspended ori' shalt, ot' auniversal coupling conthcm, said coupling i n'cliuling an inra; memberrigidl,7 attached to the over ad eliait and having a central bottonirire' and a surrounding tubular extensim depending therefrom, aninternal an- Seat in said. extension, and ya rocking arme-head moimtedin the inclosing Incinlier and to which the suspended elia-lit is ra yattached, the cross-head having a f ral, dmvnwardly llared and openrecess ouen which said shaftpasses, combined l o-conical retainerhaving,` an an- ,re fitting oil tight in said anand passino' upwardaround the .l retainer incr-casingr the effective the inclosing' memberof the con- 'erin an eil chamber, and a driving 'olv connected withAsaid member e and concentric therewith.

e conplin.

' 'l' be class described, in

renacer;

combination a rotatable member' and a cross head supported therein torotate therewith but capable of a rocking; movement relative to saidrotatable member, said cross head having a eo-axial :truste-conicalrecess open at its lower end and said rotatable member having' a partprojecting into said Trusteconical recess.

8. In a device of the class described in combination a rotatabledrivingelement, a

cross head having trunnione` and provided with a (fo-axial downwardlyopen recess in its lower part, said trunnions being connected with. saidrotatable driving member to permit movement in the plane olE the axis ofsaid driving member bnt preventing other movement relative thereto, thewall of the recess of said cross head being,r apcrtured late'ally toestablish connection between the recess and the exterior or' the crosshead.

9. Mechanism for supporting a dependingshaft comprising, a shaft, arocking croeehead secured to the shaft and having a circular bottomrecess, and a supporting member for the erosshead having a centralopening` through which the shaft extends ad having an annular oilchamber the inner wall ot' which projects into the recess ot thecrosshead the recess being larger than the said inner Vall to permit arocking,r movement whereby the parts of the cross head may dip into theoil in the annular oil cha m'ber.

10. A universal joint comprising a rotatable driving member havin@ anoil chamber and a central bottom opening, a shaft eX- -tending throughsaid opening, a crosshead secured to the shaft and connected to rook inthe driving member but rotate therewith and a bearing` supporting` thecrosshead and mounted in the oil reservoir of the drivinfgr i'ncniberwhereby the supporting bearing may be thereby lubricated While the oilisprevented :from esca ping` onto the shaft.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing; witnesses.

CHARLES F. NEEDHAM. lllitncsscs CHARLES F. Massen, ,lonN GnnnNALt..

